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TABLE 2: Significant correlations among AHI, neck circumference, cephalometric parameters, and upper airway size in patients with OSAS
Parameters NC (cm) PNS-U (mm) SP-max (mm) MP-H (mm) EU NH IH
AHI .411 .363 .339 .420 −.446 .376 
NC 1000 .383 
PNS-U .383 1000 .422 .545 
SP-max .422 1000 −.365 
MP-H .545 1000 .306 
SNB (angle) .380 
IU .325
Note.—Values are correlation coefficients. Significance is defined as P < .05. AHI indicates apnea-hypopnea index; OSAS, obstructive sleep apnea syndrome; NC, neck circumference; PNS-U, distance from the posterior nasal spine to the tip of the uvula; SP-max, maximum distance of the soft palate perpendicular to PNS-U; MP-H, distance from mandibular plane to the hyoid bone; EU, cross-sectional area at level of uvula in expiration; NH, cross-sectional area at level of hypopharynx in tidal breathing; IH, cross-sectional area at level of hypopharynx in inspiration; SNB, angle where S is the midpoint of the sella, N is the nasion, and B is the deepest point on the outer mandibular contour; IU, cross-sectional area at level of uvula in inspiration.